coverup is under way. And igor the rifleman is nowhere to be found. I want to bring in Martha Raddatz and colonel Steven -- this animation of this missile, sources saying it took just 30 seconds to reach the jet? It travels 2 1/2 times the speed of sound. So, it was about 30 seconds before it hit the airliner. Much faster than a shoulder-mounted missile can go. And the sa-11 is not a heat-seeking missile. The operator picks a target and it sees the reflection of the energy off of the skin of the airliner, and locks on. And Steve, a lot of questions on whether the black boxes were recovered. But you made the point, investigators looking for something that may be even more telling. Well, it's important to note that the black box will only tell us it was a perfectly good airplane right up until the point of impact. We need to get investigators to the crash scene, looking for clues like explosive residue or fragments. We're looking for who should be accountable. Tonight, we turn to the faces of the families onboard. And to the American, a young man

This transcript has been automatically generated and may not be 100% accurate.

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